Japanese Puzzle Box Lid (without equation)

Summary The puzzler I'm building this puzzle box for would surely recognize the hint implied in the equation and this would spoil his enjoyment of the puzzle so I removed the equation from the lid. Prints up fine. Instructions Opened the original part in netfabb studio. Used the repair function to yank out the triangles that made up the equation. Used "repair all holes" command to close up the holes where the letters and symbols were.